i keep ordering stuff i dont need

ok so i know im a grad student and supposed to be studying all the time but whenever i see something cool on amazon or some random website, i just have to click buy now. its like my fingers have a mind of their own and they wont stop pressing buttons until i get what i want. right now my room is full of stuff id never use more than twice. im starting to think maybe everyone does this but no one talks about it. am i the only weirdo or are you guys like me too? do i need help or is it normal?